U.S. security and law-enforcement officials say they have fresh evidence of recent efforts by Iran to evade sanctions and acquire metals from China used in high-tech weaponry, including long-range nuclear missiles. Iran's efforts are detailed in a series of recent emails and letters between Iranian companies and foreign suppliers seen by The Wall Street Journal. Business records show one Iranian company, ABAN Commercial & Industrial Ltd., has contracted through an intermediary for more than 30,000 kilograms (about 66,000 pounds) of tungsten copper -- which can be used in missile guidance systems -- from Advanced Technology & Materials Co. Ltd. of...
